Heya. I just put this together and am having some kind of oddness happening to me and was looking for some help.
I have an Elegoo Uno R3 and the Elegoo TFT screen as well as having the SDrive on its own power supply via the barrel jack. When I power up the Atari the screen on the SDrive gets corrupted, but I can just tap the ready on the bottom and then close that window and it redraws the screen fine. However, I think because of this the Atari wont boot from the SDrive on power on. I can get the SDrive to work by typing "bye" and going to the diagnostic screen then pressing the reset button. From there, the Atari will boot from the SDrive and it functions as normal. The SDrive is the only connected SIO device and has the proper diode and there is no 5v connection from the SDrive to the SIO port. I've tried the V0.7 release, the 1.0b2 and 1.1b with the same issue.